(pyqt) Parameters when connecting a signal to a method?

[exhuma.twn]

Some code:

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def foobar(w):
   print w

QtCore.QObject,connect( my_line_edit,
QtCore.SIGNAL("returnPressed()"), foobar )

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How can I get this to work so "foobar" prints out the sender of the
signal (i.e. my_line_edit)?